[2] It is still in use in various marine applications today, such as the Upholder / Victoria class submarines, and additionally to provide the electrical power to propel and operate the Royal Navy's Type 23 frigates.

[10] In May 2005, First Great Western had Brush Traction fit two with MTU 16V4000 R41 engines,[11] these V16 units which use common rail fuel injection are ultimately capable of developing 2,720 kilowatts (3,700 metric horsepower; 3,650 brake horsepower), though they are de-rated in the Class 43 HSTs to match the performance of the original Paxman engine.

[7] Judged a success, no doubt due to improved fuel economy,[7] as part of a project to extend the lives of the HSTs, First Great Western decided to re-power its entire fleet.

Great North Eastern Railway (GNER), CrossCountry, Network Rail, and Grand Central also decided to re-power their fleets with MTUs.

It received a full overhaul, and was fitted with a reconditioned Paxman Valenta RP200L engine, number S508 installed new into Virgin CrossCountry's 43153 in 2001, before re-installation into First Great Western's 43143 after a spell in storage.

[17] The engine was also fitted to the State Rail Authority's New South Wales XPT, or Express Passenger Train, which was based on the HST power car design.